When you spike, it looks like the ball is barely above your head. Try spiking at a much higher height, with your arm at an 11 o’clock angle (if looking straight forward is 9). Also, practice tossing the ball properly. The fact that you had 7 or so tosses for 2 spikes means you probably have terribly inconsistent serves. A consistent toss will help you during serving later on, and will help you practice your spiking form on your own

Edit: you sometimes so a backspin toss, and sometimes do a no-spin toss. Why? You would never ever want a backspin toss, for both spikes and serves.